The note, taped to the underside of the woman's toilet seat, reads: “This chick just told me she has a boyfriend the morning after. Sorry to tell you like this, but I’d want to know if I was you. Sorry bro.”

GldnUnicorn writes on Reddit: "Used a receipt and part of my duct tape wallet. You guys think I did the right thing trying to tell him? Or should I just have left him not knowing his girlfriend cheats on him?"